Page 66 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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where

HTU Y= (211)
° YV

is the overall height of one mass transfer unit, calculated for the gas phase, and

(212)

is the overall number of mass transfer units in the apparatus calculated for the
gas phase.
According to equation (210) the height of the packing is a product of
the number of mass transfer units and the height of one mass transfer unit.
In the same way from equations (198) and the mass balance for the
liquid phase

G = G X.(X 2-X I) , (213)

it can be obtained:

#*"* v ~y r
L
H = ^ 2 —— , (214)
W A V
m
or

H = HTU m.NTU ox, (215)

where

f=^— (216)